the only people who fear it are ignorant of how it works, or they havea vested interest in a competitor and are worried just how far behindthey are.

Depends on what you mean by "fear". I "fear" it's going to have a lot ofnasty failure modes.

nothing is perfect, and its failure modes aren't nasty.actually, the one that comes to mind is one you *didn't* mention, andthat's identical twins.

there's a very high chance that one twin can unlock the other twin'sphone.

of course, identical twins are used to fooling teachers, friends, andeven parents, so it's not surprising they can fool a phone, at least,with today's technology. that will no doubt improve over time.

Post by Eli the BeardedI know someone who flipped their car. Airbags went off and one smashedher glasses into her face. Swollen, bruised, slight bleeding. Would shebe able to unlock her phone?

most likely, yes, but in that situation, the appropriate action is tosimply hold the side buttons to activate the emergency call screen,without needing to unlock or dial anything. that also can be done froman apple watch.

<https://support.apple.com/en-us/HT208076>

your question could be asked about any unlocking method. what ifsomeone's hands are injured such that they can't authenticate via afingerprint sensor, or even use their fingers to use the phone at all?

Post by Eli the BeardedAnother: Movember is upon us. People will grow moustaches for the monthand shave them off in December. Will that break things?

no.

in fact, face id is designed to handle that very situation, somethingwhich apple has explained.

facial hair, eyeglasses, makeup, wearing a scarf, hat or even amotorcycle helmet, is not an issue.

do note that some sunglasses (but not all) block infrared light, so ifthe person is wearing ones that do, or they have something coveringtheir entire face, such as a surgical mask, then face id won't work.

also keep in mind that a fingerprint sensor doesn't work in allsituations either, such as when wearing gloves or if one's fingers aregreasy or wet.